Grinding-machine.



"no. 727,033. PATENTED MATY 5.19 03.

Z. R. TUCKER. GRINDING MACHINE.

urmonxon FILED r1112. 5. 1902.

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No. 727,033. PATENTED MAY 5,1909

I Z. R. TUCKER.

GRINDING MACHINE.

, APPLICATION FILED FEB. 5. 1902. 110 MODEL.

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mvEmon WITNESSES: I I X i! I W ATTORNE J UNITED TATES Patented May 5,1903.

ATENT FFICE.

ZECHARIAH RHODES TUCKER, PROVIDENCE, RHODE ISLAND, ASSIGNOR TO UNIVERSALMACHINE COMPANY, OF PROVIDENCE, RHODE ISLAND, A CORPORATION OF RHODEISLAND.

GRINDING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 7 7, dated M y 1903- 1Application filed February 5, 1902. Serial No. 92,612. (No model.)

To aZZ whom it may concern:

Be it known that I, ZEOHARIAH RHODES TUOKER,rcsiding at Providence,inthe county of Providence and State of Rhode Island, have 5 inventedcertain new and useful Improve-- ments in Grinding-D/Iachines,of whichthe following is a full, clear, andlexact description, such as willenable others skilled in the art to which it appertains to make and usethe same.

This invention relates to a grinding-machine; and its object is toprovide a new and efficient means of mounting, of driving, and offeeding the grinding wheel or wheels.

To these ends the invention consists in the features of construction andcombinations of elements, which will be hereinafter more fully setforth, and the novel features thereof specifically pointed out in theclaims at the end of this specification.

While I illustrate and describe the invention in connection withgrinding-machines, it will be understood that certain features thereofmay be used in connection with various types of tools and in variousrelations with different kinds of machines.

A preferred embodiment of the invention is illustrated in theaccompanying drawings, in which Figure 1 is a side elevation of agrinding- 0 machine, showing a reciprocating carriage andgrinding-wheels mounted in accordance with my invention inoperativerelation thereto. Fig. 2 is an end elevation of the same. Fig. 3 is alongitudinal vertical sectional View of the head which carries thegrinding-spindle and the accompanying parts. Fig. 4 is a sectional viewon line :rccof Fig. 3 looking in the direction of the arrow, showingalso in elevation a central driving pulley and a forked bracket or guidetherefor.

This machineas illustrated is especially adapted for grinding cylindersin cases Where two cylinders are mounted on a frame in such a way thateach cylinder cannot be held in an ordinary grinding-machine andrevolved to give the feed to the wheel.

A designates the frame of a grinding-machine, which may be of anydesired construction and is provided, as shown, with a cone- 5o pulleyB, mounted upon the shaft C, (shown in dotted lines in Fig. 1,) whichshaft is belted or geared with the carriage-reciprocating mechanism. Thecarriage is shown at E reciprocable upon suitable ways upon the frameand having stops F F in connection therewith which contact with thepivoted lever Gr, through which the carriage reciprocating mechanism isactuated. These parts may be of any usual and well-known construction,as

it is only necessary in carrying out my invention that a suitablesupport should be provided for the work, which is preferably, asillustrated, in the form of areciprocating carriage.

l l are the two side members of abridge or span, which side members arebolted to the sides of the frame and are connected by a cross-piece 2 atsome little distance above the top of the base, thus providing a spacebeneath the bridge through which the carriage can reciprocate, wherebyboth compactness of structure is obtained and the Working parts of themachine are protected, especially from emery-dust, which is alwayspresent in large quantities in the operation of these machines.

On the-undercut way or dovetail 3, carried by the bridge 2, arereciprocable two carriages 4, whichmay be secured at any desired point,as by means of gibs 5 and set-screws 6. These carriages are adjustableby means of independent screws 7, cooperating with feednuts 8, in orderto agree with the center distance between the cylinders being ground, orthey may be operated by a right and left hand screw or other means ofsetting them at the correct center distance with relation to each other.Mounted upon each of these carriages is the spindle of a grinding-wheel,and except wherein otherwise specifically indi- 9o cated a descriptionof the mounting of one spindle applies to both.

Referring more specifically to Figs. 3 and 4, the spindle consists of ashaft 10, fitted with a grinding-wheel 11 at one end and tapered orconical bearings 12 12 at each end, which may be provided with suitableadjustments for taking up wear. At the outer end of the shaft 10 is adriving-pulley 13. This spindle is mounted in a sleeve 14, provided withsuit- 10o able inclined bearing-surfaces 15, 'corresponding to theconical bearings upon the spindle-shaft. A portion of the exterior ofthis sleeve is eccentric, as indicated at 16, or it may be said that thebore withinv which the spindle is mounted is eccentric to the main axisof the sleeve. This eccentricity is provided as a means for bringing thewheel-spin dle to or from the center of the cylinder being ground toadjust for the depth of cut and compensate for the wear of the wheel.This adjustment is accomplished in this instance by means of a worm 17,teeth being cutin the sleeve which mesh with the teeth upon the worm 17for rotating the sleeve. The power for driving this worm may be suppliedin any suitable way, as here shown hand-wheels 19 19 being supportedupon theend of the shaft which carries the worm. The shaft which carriesthe worm 17 has its bearings transverse to the shaftIO in a secondsleeve 20, within which the sleeve 14 is mounted. An annular flange 21is provided in connection with the eccentric portion 16 of the innersleeve, which lies in a rabbet in the outer sleeve, and a means foradjustment and taking up wear is provided through thenut 21, whichscrews onto the threaded end of sleeve 14., as at 22, and bears againstthe outer end of sleeve 20. The sleeve is mounted in the same way, witha flange 23 at one end and a threaded adj ust-ing-nut 24 at the otherwithin the head 25, which is formed integral with or may be suitablyattached to the carriage 4, hereinbefore described. In order to feed thespindle with reference to the stationary cyl inder, means are providedby which the wheelspindle while revolving at a high rate of speed togive the cut to the Wheel may also describe a circle around the insideof the cylinder to furnish the feed of the wheel to the work. It will beseen that to belt to the spindle, which should run at an exceedinglyhigh rate of speed, perhaps ten thousand revolutions per minute in theparticular instance at hand, is an extremely difficult operation whilethe center of the spindle or shaft bearing the pulley is gyrating aroundin a circle. An ordinary arrangement of pulley and driving-belt would beinoperative because of the lack of uniform tension on the belt. In thepresent instance the sleeve 20 is eccentrically mounted within its head25 and driven from a shaft 26, which carries a spiral pinion 27, keyedthereto, so as to have a long range of adjustment thereon by meansof'extended keyways. (Shown in dotted linesinFigAat28.)Thisspiralpinionmeshes with spiral teeth 29, formed on the exteriorsurface of the outer eccentric sleeve. Shaft 26 extends transverselyacross the machine and carries a spiral pinion at each end, so that itprovides a feed for each of the wheel-spindles,as illustrated,and it isdriven by means of a pulley 30, located between the two carriages andsuitably secured thereto. This pulley may be driven from any suitablesource of power, a portion of a belt 81 being indicated in Fig. 1. Theheads 25 may be capped, as shown, for purposes of assembling and ofadjustment, the pinions27 being located within housings 32. In order tocompensate for the variation in length of the belt due to therevolutions of the axes of the wheel-spindles, the eccentric sleeves 1414,. carrying the wheel-spindlesyare set with one spindle at the top andthe other at the bottom, or in such relative position as may be foundmost effective, so that as they feed they work in opposition to eachother, and thereby compensate for the length of the belt 33, by whichthey are driven from any suitable source of power, as indicated in Fig.2. In order to maintain sufficient contact with the belt and also toassist in such action of the spindles, an idler-pulley is located aboveand midway between the two spindles and the belt looped therearound.This pnlleyis supported upon a stud 36, which stud may be clamped at anypoint of a longitudinal slot 37- in the frame 38, thus providing anadjustment to compensate for stretching of the belt or for otherreasons, as desired. A suitable adjusting-plunger 89 is preferablyprovided therewith, so that the adjustment may be readily secured byhand. Frame 38 is bolted at its end, as at 40, to the base or frame ofthe machine and may be also stiffened by being bolted to the bridge 2,as at 41. Extending inwardly from this frame and suitably securedthereto may be provided a forked bracket 42, the forks of which extendon either side of the pulley 30 to guide the pulley and belt, as this ismounted on a shaft and capable of sliding to allow for the adjustment ofthe spindle.

From the above description it is thought that the operation will besufficiently clear. The work is chucked or supported in suitablerelation to the grinding-wheels, and through the described mounting ofthe two spindles and means for driving and feeding them a constructionis provided such that two cylinders may be ground at the same timeefficiently and expeditiously. By the independent adjustment of thespindle-carriages the spindles may be .set at any desired point withrelation to each other, depending upon the work to be ground, and thedriving and feeding means are so arranged as to allow for suchadjustment without interfering therewith.

It will of course be obvious that any even number of spindles whichmight be operated in pairs could be used instead of the duplicateconstruction herein illustrated. Moreover, it has been shown by.experiment that a machine will work using three spindles, set

one-third the way around the circle each. The error in such a case, ifany, is so small as to be practically negligible. Accordingly the numberof spindles which may be used in such a construction is practicallyunlimited. Where it is desired to use an odd number of live spindles,however, it may be preferable from the practical standpoint to obviatechances of error by adding an idler or dummy head carrying a pulleywhich would go through the same motions as the active or live spindlewould, or a belt-tightening device could be arranged on the slack sideof the belt feeding onto the first pulley.

Having described my invention, what I claim as new, and desire to secureby Letters Patent, is

1. In combination, a plurality of tool-spindles, sleeves within whichsaid spindles are eccentrically mounted, means for rotating saidsleeves, and means for driving said spindles from a common source ofpower.

2. In combination, a plurality of tool-spindles, a sleeve within whicheach of said spindles is eccentrically mounted, means for rotating eachof said sleeves, and a single belt by which all of said tool-spindlesare driven.

3. In combination, a plurality of tool-spin dles, sleeves within whichsaid spindles are eccentrically mounted, means for rotating said sleevesfrom a common source of power, and a single belt by which said spindlesare driven.

4. In combination, a plurality of tool-spindles, means for revolvingeach of said spindles about an outside axis, and means for driving saidspindles from a common source of power.

5. In combination, a plurality of tool-spindles, means for revolvingeach of said spindles about an outside axis, means fordriving saidspindles from acommon source of power, and means for independentlyadjusting the relative positions of said spindles.

6. In combination, aplurality of carriages, a sleeve revolubly supportedon each of said carriages, a driven shaft and means for rotating each ofsaid sleeves from said shaft, a tool-spindle eccentrically mounted ineach of said sleeves, and means for driving said tool-spindles.

7. In combination, a plurality of carriages, a sleeve revolublysupported on each of said carriages, a driven shaft and means forrotating each of said sleeves from said shaft, a tool-spindleeccentrically mounted in each of said sleeves, and means for drivingsaid tool-spindles from a common source of power.

'8. In combination with a work-holdingbase,

a plurality of carriages mounted on said base and independentlyadjustable thereon, a sleeve revolubly supported on each of saidcarriages, means for rotating said sleeves, a tool-spindle eccentricallymounted in each of said sleeves, and means for driving said toolspindlesfrom a common source of power.

9. In combination with a work-holding base, a plurality of carriages, asleeve revolubly supported on each of said carriages, means for rotatingsaid sleeves from a common source of power, a tool-spindle eccentricallymounted in each of said sleeves, and means for driving saidtool-spindles.

10. In combination with a work-holding base, a plurality of carriages, asleeve revolubly supported on each of said carriages, means for rotatingsaid sleeve,a tool-spindle eccentrically and adjustably supported ineach of said sleeves, and means for driving said tool-spindles from acommon source of power.

11. In combination with a Work-holding base, a plurality of carriages, asleeve revolublysupported on each of said carriages, a tool -spindleeccentrically mounted within each of said sleeves, means for rotatingsaid sleeves, and a single belt by which all of said spindles aredriven.

12. In combination with a work -holding base, a plurality of carriages,a sleeve revolubly supported on each of said carriages, a tool -spindleeccentrically and adjustably mounted within each of said sleeves, meansfor rotating said sleeves, and a single belt by which all of saidspindles are driven.

13. In combination with a work-holding base, aplurality of carriages, asleeve revolubly supported on each of said carriages, a tool spindleeccentrically and adjustably mounted within each of said sleeves, meansfor rotating said sleeves, a single belt by which said spindles aredriven, and an independent guiding device for said belt whereby propertension of said belt with respect to said toolspindles may bemaintained.

14. In a grinding-machine, in combination, a suitable base, carriages 4,4, independently adjustable on said base, eccentric sleeves 20, 20,revolubly mounted on each of said carriages, a shaft 26, gearing betweensaid shaft and each of said sleeves, a grinding-wheel spindle carried byeach of said sleeves, and means for driving said spindles.

15. In a grinding-machine, in combination, asuitable base,carriages 4,4, eccentric sleeves 20, 20, revolubly mounted on each of saidcarriages, a shaft 26, gearing between said shaft and each of saidsleeves, a grinding-wheel spindle carried by each of said sleeves,meansfor driving said spindles, and means for independently adjusting saidcarriages with re lation to said base and to each other.

16. In a grinding-machine, in combination the wheel-spindles, theeccentric sleeves within which said spindles are supported, means forrotating said sleeves to feed the spindles, driving-pulleys on the outerends of said spindles, a driving-belt common to said pulleys, and anidler-pulley in suitable relation to said driving-pulleys over whichsaid belt passes, substantially as and for the purposes set forth.

17. In a grinding-machine, in combination, the wheel-spindles,theeccentric sleeves within which said spindles are supported, means forrotating said sleeves to feed the spindles, driving-pulleys on the outerends of said spindles, a driving-belt common to each of said pulleys,and an adjustable idler-pulley in suitable relation to saiddriving-pulleys over which said belt passes, substantially as and forthe purposes set forth.

18. In combination, the wheel-spindles, the eccentric sleeves in whichsaid spindles are mounted for purposes of adjustment, the outereccentric sleeves Within which said fi rstmentioned sleeves are mounted,means for rotating said outer sleeves in order to give the feed to thewheel-spindles, and a driving means common to said spindle.

19. In combination, the wheel-spindles, the eccentric sleeves in whichsaid spindles are

